bias ply help

so for what I want to run I am going to have to go with a bias ply, but looking at cokers in size 525/16 or 550/16 or 600/16 every one says it requires a tube. But diamondbacks site says DONT use tubes. So are they necessary, who runs em? I dont want tires with tubes in em.
any suggestions

 

You should consult the people you are buying the tires from. I just bought 4 new Cokers and 4 new tubes but you might be able to run them tubeless.

 

I have tubes in my 'stones from Coker. Three years and almost 8000 miles, still doing great just ran down the freeway today at 80 and they are treat for being bias ply.

 

I have several sets of Cokers... With NO tubes and NO problems